**Core Concept**
The somatosensory cortex is responsible for processing sensory information from the body, including touch, pain, temperature, and proprioception. The somatosensory cortex is organized in a somatotopic manner, meaning that different areas of the cortex correspond to different parts of the body.

**Why the Correct Answer is Right**
The somatosensory cortex is divided into four main areas: I, II, III, and IV. Each area receives input from different types of sensory receptors and is responsible for processing different types of sensory information. Area I is the primary somatosensory cortex, which receives direct input from the thalamus and is responsible for processing fine tactile and proprioceptive information. Area II is the secondary somatosensory cortex, which receives input from Area I and is responsible for processing more complex sensory information. Area III and IV are also involved in processing sensory information, but their exact functions are less well understood.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify which area of the somatosensory cortex is being referred to.
**Option B:** This option is incorrect because it does not accurately describe the organization of the somatosensory cortex.
**Option C:** This option is incorrect because it is a distractor and does not relate to the somatosensory cortex.

**Clinical Pearl / High-Yield Fact**
The somatosensory cortex is often damaged in patients with stroke, resulting in loss of sensation or numbness in the affected area. This can be a classic exam question, so remember the somatotopic organization of the somatosensory cortex to answer correctly.

**Correct Answer: D. 1, 2, 3, 4. All areas of the somatosensory cortex are involved in processing sensory information from the body.**